1. Department of Surgery, Soonchunhyang University Seoul Hospital, Seoul, Korea.
2. Department of Surgery, University of Ulsan College of Medicine, Gangneung Asan Hospital, Gangneung, Korea.
3. Department of Surgery, Keimyung University Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea.
4. Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea.
5. Department of Surgery, International St. Mary's Hospital, Catholic Kwandong University College of Medicine, Incheon, Korea.
6. Division of Colorectal Surgery, Department of Surgery, St. Paul's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
7. Department of Surgery, Daegu Fatima Hospital, Daegu, Korea.
8. Department of Internal Medicine, Bundang Jesaeng Hospital, Seongnam, Korea.
9. Division of Pediatric Surgery, Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
10. Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea.
11. Division of Gastroenterology, Department of Internal Medicine, Pusan National University College of Medicine, Busan, Korea.
12. Department of Surgery, Hallym University Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
13. Division of Gastrointestinal Surgery, Department of Surgery, Kosin University College of Medicine, Gospel Hospital, Busan, Korea.
14. Department of Statistics, Dongguk University, Seoul, Korea.
15. Department of Surgery and Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.
16. Department of Surgery, Chonbuk National University Medical School, Jeonju, Korea.
17. Department of Surgery, Konkuk University School of Medicine, Seoul, Korea.
18. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
19. Department of Surgery, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
20. Nutrition Team, Kyung Hee University Medical Center, Seoul, Korea.
21. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea.
22. Department of Burn Surgery and Critical Care, Burn Center, Hallym University Hangang Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
23. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
24. Department of Surgery, Jeju National University Hospital, Jeju, Korea.
25. Division of Gastroenterologic Surgery, Department of Surgery, Chonnam National University Hwasun Hospital, Hwasun, Korea.
26. Department of Surgery, Gyeongsang National University Hospital, Jinju, Korea.
27. Department of Food and Nutrition, Yeonsung University, Anyang, Korea.
28. Division of Acute Care Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.